Ultra Pure High-Potency 5.0% Niacinamide Serum, 1 oz.

4.6 (574)
$40.00
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Product details

Web ID: 15795951
A concentrated facial serum formulated with just 10 ingredients (aqua/water, niacinamide, glycerin, propanediol, methyl gluceth-20, hydroxyacetophenone, sodium hyaluronate, caprylyl glycol, carbomer and sodium hydroxide) to help visibly reduce oil and minimize the look of redness.

  • Product Features

    • WHAT IT IS:
    • A serum with 5% niacinamide
    • WHAT IT DOES:
    • Helps visibly reduce excess oil and minimize the look of redness
    • INGREDIENT HIGHLIGHTS:
    • Niacinamide, the form of vitamin B3 used within Kiehl's formulas, helps visibly brighten skin; when used in topical skincare formulas, niacinamide can also help balance skin's surface oil
    • SKIN TYPES:
    • For all skin types, including sensitive skin
    • HOW TO USE:
    • In the morning and evening, apply 2-3 drops to clean, dry skin
    • Skin Hacks:
    • Zone treat your face by applying the serum to areas prone to oiliness and breakouts and following with your favorite moisturizer where needed
    • Layer with the Hyaluronic Acid Serum to hydrate and rebalance skin's moisture
    • Layer with the Glycolic Acid Serum to gently exfoliate and improve texture
    • RESULTS:
    • After 1 week, skin feels soothed*
    • Instantly reduces excess oil by 58%**
    • Reduced blemishes in 1 week***
    • *Based on reports by consumers in a 4-week study
    • **Based on instrumental measurements in a 4-week clinical study
    • ***Based on expert grading in a 4-week clinical study

  • Shipping & Returns

    • This item qualifies for Free Shipping with minimum purchase! exclusions & details
    • California and Minnesota customers call 1-800-289-6229 for Free Shipping information.
    • For complete details, see our Shipping and Returns policies.
    • Please call customer service for returns.
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    Kiehl's Since 1851

    Ultra Pure High-Potency 5.0% Niacinamide Serum, 1 oz.

    $40.00

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    Step 3

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Item 4 of 3

Ratings & Reviews

Here's what customers think
  • This serum is highly effective for a range of skin types and concerns.
  • Many users reported it helped control oil and shine, minimize pores, and improve skin texture and clarity.
  • The lightweight, non-irritating formula was praised for absorbing quickly.
  • Several saw benefits in fading dark spots, evening skin tone, and reducing redness and inflammation.
  • While a few found it slightly drying, most were very satisfied with its hydrating and smoothing effects.
AI-generated summary from 568 customers reviews.
4.6/5

574 star ratings, 568 reviews

Write a Review
69.9% of reviews have 5 stars
401
23.3% of reviews have 4 stars
134
4.9% of reviews have 3 stars
28
1.0% of reviews have 2 stars
6
0.9% of reviews have 1 star
5

100 customer images

568 reviews
elena05_2940
7 months ago

Amazing serum

I’ve been using this for a few weeks, and here’s my honest review ✅ Reduces excess oil & shine ✅ Calms redness + post-acne flare-ups ✅ Layers beautifully – no pilling or sticky residue ✅ Lightweight, fast-absorbing, and fragrance-free Would I recommend it? YES — especially for oily, sensitive, or acne-prone skin. If you’re looking for a gentle niacinamide serum that keeps your skin clear and balanced without irritation, this is a solid pick.

Customer review from influenster.com

Farjana Tahmin
7 months ago

Work well

Worth it

Helpful?
Lou1221
7 months ago
from Moscow, idaho
Incentivized review

Best serum for oily skin!

I love this serum! It feels great on the skin and has really helped with my skins oiliness!

Recommends this product

Customer review from kiehls.com

ga002
7 months ago
from melbourne

Not for me

I wanted to love this but every time I try it my whole face would break out :( had to stop using it

Customer review from kiehls.com.au

calish20
7 months ago
from Chicago, IL

Nice product

All this product have helped me to improve my face condition which was dry and not smooth

Recommends this product

Customer review from kiehls.com

Turbo3000
9 months ago
from San Francisco

Nice to mix with the Hyaluronic Acid serum

I've been mixing this with Hyaluronic Acid serum and I'm loving the combination and results. I feel tighter, more hydrated a little less red.

Recommends this product

Customer review from kiehls.com

Tammy
1 year ago
from Phillipsburg, NJ
Did you read product reviews online before purchasing this item?Yes

Trusted because it works.

I trust this brand for its true nature and effective products.

Recommends this product

Helpful?
BreezyC
1 year ago
from New York

Byebye blemishes

I LOVE this product. I have super sensitive acne prone combination skin and shockingly this product clears my pimples within a few days without drying or causing eczema patches. It's pricey but it works.

Recommends this product

Customer review from kiehls.com